An optional front-end protection (FEP) sub-circuit, controlled by the LM74910-Q1 integrated circuit (IC), that acts as a programmable electronic safety switch with numerous safety features.
A LM25148-Q1 buck converter, referred to as the 5V pre-regulator, that accepts the wide input voltage, and generates a well-regulated 5V voltage level. This 5V rail, in turn, supplies the main point-of-load (POL) converters, which regulate the various voltages needed to supply the VE2302 device.
Two TPS62876-Q1 regulator ICs are used to implement a dual-phase, interleaved converter that powers the main digital core rail.
A LP87694-Q1 Power Management IC (PMIC) and TPS746-Q1 Low Dropout (LDO) linear regulator are used for the remaining rails.
The PMIC is highly integrated and contains programmable general-purpose input and output (GPIOs) pins which have been programmed in this design to both perform the voltage supervision, as well as the converter rail sequencing tasks. However, if a discrete, dedicated voltage supervisor is desired, a dedicated auxiliary voltage supervisor IC, TPS389006-Q1, is available for use in place of the voltage supervision implemented in the PMIC.
There is also a TPS7B6933-Q1 LDO to generate an always-ON bias supply, which powers a number of subcircuits, such as the auxiliary voltage supervisor IC, as well as the power good indication LEDs. If a 3.3V always-ON power supply already exists in the system, then the TPS7B6933-Q1 LDO is not needed.